JP2645486B2 - Embankment erosion prevention method - Google Patents
Embankment erosion prevention methodInfo
- Publication number
- JP2645486B2 JP2645486B2 JP63239687A JP23968788A JP2645486B2 JP 2645486 B2 JP2645486 B2 JP 2645486B2 JP 63239687 A JP63239687 A JP 63239687A JP 23968788 A JP23968788 A JP 23968788A JP 2645486 B2 JP2645486 B2 JP 2645486B2
- Authority
- JP
- Japan
- Prior art keywords
- erosion
- erosion prevention
- embankment
- mat
- shore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Revetment (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、堤の浸蝕防止工法に関する。The present invention relates to a method for preventing erosion of a bank.
「従来の技術」 海浜の波浪による浸蝕を防止するための消波ブロック
は知られており、また、海岸から少し離れた沿岸に石塊
・コンクリート構造物等（以下これらを石塊と総称す
る）を構築し、その頂部を常時海面上に露出させている
離岸堤・防潮堤・突堤等や、沈下させている潜堤（以下
これらを堤と総称する）も知られている。"Prior art" Wave-dissipating blocks for preventing erosion by waves on the beach are known, and stone blocks, concrete structures, etc. on the coast slightly away from the coast (hereinafter, these are collectively referred to as stone blocks). There are also known breakwaters, seawalls, jetties, etc., whose tops are always exposed above the sea surface, and submerged embankments (hereinafter collectively referred to as embankments).
しかし、この堤の基礎部分の土砂は、波浪又は海底流
の運動によって起こる水底を形成する自然土砂の流動に
より浸蝕され、堤が崩壊するおそれがある。However, the sediment at the foundation of the levee may be eroded by the flow of natural sediment forming the water bottom caused by the action of waves or submarine currents, and the levee may collapse.
他方、公表特許公報昭61−501215号公報には、多数の
細長い葉状体のマットに固着した河川工事における土質
安定装置が示されている。On the other hand, Japanese Unexamined Patent Publication No. 61-501215 discloses a soil stabilizing device for river construction fixed to a large number of elongated foliate mats.
また、実開昭60−100435号公報に、水柱の地盤上に築
く基礎の下に敷設する被覆材に繊毛を設けて芝状とする
技術が開示されている。しかし、この技術は、水流の減
衰抑止効果が小さく、潮流のある海岸では不向きであ
り、また、既設の堤には適用できない。Further, Japanese Utility Model Application Laid-Open No. 60-100435 discloses a technique in which cilia is provided on a covering material laid under a foundation laid on the ground of a water column to form a turf. However, this technique has a small effect of suppressing water flow attenuation, is not suitable for coasts with tidal currents, and cannot be applied to existing dikes.
［発明が解決しようとする課題］ したがって、本発明は、土砂の流出を防止して、海岸
から少し離れた沿岸に築造する堤の浸蝕を防止し、併せ
て漁場・人工海浜の造成も可能な堤の浸蝕防止工法を提
供することを目的としている。[Problems to be Solved by the Invention] Therefore, the present invention prevents the outflow of earth and sand, prevents the erosion of the levee built on the coast slightly away from the coast, and also allows the creation of fishing grounds and artificial beaches. It aims to provide a method for preventing erosion of the embankment.
［課題を解決するための手段］ 本発明によれば、海岸から少し離れた沿岸に築造する
堤の浸蝕防止工法において、堤を海岸にほぼ平行に平面
形状を略矩形状に少なくとも２つ長手方向に離して築造
し、多数の細長い葉状体の下部をマットに固着して砂の
移動を制御する浸蝕防止部材を前記築造した堤の長手方
向に離した部分および堤の周囲の海底に敷設する。[Means for Solving the Problems] According to the present invention, in a method for preventing erosion of a levee built on a shore slightly away from the shore, at least two levees are formed in a substantially rectangular shape in a plane substantially parallel to the shore. The erosion preventing member for controlling the movement of the sand by fixing the lower portions of the many elongated leaves to a mat is laid on the portion of the built levee that is separated in the longitudinal direction and on the seabed around the levee.
上記葉状体は、例えばポリプロピレン等の無毒で耐海
水性があり比重が例えば0.4〜0.5g/cm3の材料で形成す
るのが好ましい。The foliate body is preferably formed of a nontoxic, seawater-resistant material having a specific gravity of, for example, 0.4 to 0.5 g / cm 3 , such as polypropylene.
また、マットは、円形断面の縦棒と横棒とを格子状に
一体に形成し、葉状体はマットの各辺の長さ一杯に取付
けた保持片に挟持固定するのが好ましい。Further, it is preferable that the mat is formed by integrally forming a vertical bar and a horizontal bar having a circular cross section in a lattice shape, and that the leaf-like body is sandwiched and fixed by a holding piece attached to the full length of each side of the mat.
［作用］ 上記のように構成された堤の浸蝕防止工法において
は、堤の周囲および離した部分に浸蝕防止部材が敷設さ
れ、その浸蝕防止部材に設けられた葉状体は、大きな浮
力を有しているので海中に垂直な姿勢で保持され、波の
砕ける破波帯の乱流内においても土砂の流動を抑制す
る。したがって、堤の基礎部分の浸蝕を防止すると共
に、浸蝕防止部材を設けた堤の周囲および離した部分の
長さ分だけ堤を小さくすることができ、船舶の航行の安
全が確保され、良好な漁場あるいは人工海浜を形成する
ことができる。[Effect] In the erosion prevention method of the embankment configured as described above, an erosion prevention member is laid around and apart from the embankment, and the leaf-like body provided on the erosion prevention member has a large buoyancy. Therefore, it is held vertically in the sea and suppresses the flow of sediment even in the turbulence of the breaking sea where the waves break. Therefore, it is possible to prevent the erosion of the base portion of the embankment and to reduce the embankment by the length of the portion around and apart from the embankment provided with the erosion preventing member. It can form fishing grounds or artificial beaches.
［実施例］ 以下図面を参照して本発明の実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図及び第２図には、本発明を実施する浸蝕防止部
材である浸蝕防止マットＤの一例が示されている。FIG. 1 and FIG. 2 show an example of an erosion prevention mat D which is an erosion prevention member for carrying out the present invention.
この浸蝕防止マットＤは、多数の細長い葉状体８の下
部をマット１に固着して形成されている。そのマット１
は、互いに直交する縦棒２及び横棒３とからなり一体に
形成されている。これら縦棒２、横棒３は共に円形断面
に形成され、各辺には各辺の長さ一杯の保持片４が取付
けられている。その保持片４は、例えば合成樹脂等の可
撓性材で円周の上部の略1/3が切欠かれた第１の筒状部
５と、その第１の筒状部５の下方に一体に形成され、一
側方上部の円周の略1/4が切欠かれた第２の筒状部６か
らなっている。この保持片４は第２の筒状部６を縦棒２
又は横棒３に引掛けて固着され、第１の筒状部５には、
その筒状部５に嵌着する固定棒７により葉状体８が挟持
固定されている。その葉状体８は、例えばポリプロピレ
ン等の無毒で耐海水性があり比重が例えば0.4〜0.5g/cm
3の材料で形成され、長さは任意に設定できるように長
尺物に形成されている。また植生密度は、保持片４で自
由自在に変えられる。The erosion prevention mat D is formed by fixing the lower portions of a number of elongated leaf-like bodies 8 to the mat 1. That mat 1
Are formed integrally with a vertical bar 2 and a horizontal bar 3 which are orthogonal to each other. Each of the vertical bar 2 and the horizontal bar 3 is formed in a circular cross section, and a holding piece 4 having a full length of each side is attached to each side. The holding piece 4 is made of, for example, a flexible material such as a synthetic resin, and has a first cylindrical portion 5 in which approximately one third of the circumference is cut out, and a lower portion of the first cylindrical portion 5. And a second cylindrical portion 6 in which approximately 1/4 of the circumference at the upper side is cut out. The holding piece 4 is formed by connecting the second cylindrical portion 6 to the vertical bar 2.
Or, it is fixed by hooking on the horizontal bar 3,
The leaf-shaped body 8 is clamped and fixed by a fixing rod 7 fitted to the cylindrical portion 5. The foliate body 8 is non-toxic, for example, polypropylene or the like, has seawater resistance, and has a specific gravity of, for example, 0.4 to 0.5 g / cm.
Formed by the third material, it is formed on the elongated article so that it can be set arbitrarily long. The vegetation density can be freely changed by the holding pieces 4.
第３図及び第４図において、海岸Ａから少し離れた沿
岸に、石塊Ｃで平面形状が略矩形少くとも２つの離岸堤
B1、B1を長手方向に離して築造する。そして、離岸堤B
1、B1の長手方向に離した部分10と、離岸堤B1の周りの
海底に浸蝕防止マットＤを敷設する。このマットＤの葉
状体８及び保持片４の密度、長さ等は、敷設現場に応じ
て決められる。In FIG. 3 and FIG. 4, at least two offshore breakwaters, each of which is a stone block C and has a substantially rectangular planar shape, on the coast slightly away from coast A.
B1 and B1 are built apart from each other in the longitudinal direction. And the breakwater B
1. An erosion prevention mat D is laid on a portion 10 separated in the longitudinal direction of B1 and on the seabed around the breakwater B1. The density, length, and the like of the leaf 8 of the mat D and the holding piece 4 are determined according to the installation site.
その葉状体８は、大きい浮力があるため水中において
垂直な姿勢を保持する能力を持っている。したがって、
波のくだける破波帯の乱流内においても、葉状体８及び
保持片４がしなやかに海底表面を覆いかくし、土砂の流
動を妨げ、土砂、浮遊物の堆積を促進して離岸堤B1の基
礎部分の土砂が流動する土砂により浸蝕されるのを確実
に防止する。その結果、従来より大きい石塊を用いるこ
とができ、また、離岸堤B1の平面形状を小さくし、した
がって、築造コストを低減し、船舶の航行を安全にする
ことができる。これは潜堤B2（第10図）においても、同
様の効果を奏する。The foliar body 8 has a large buoyancy and therefore has the ability to maintain a vertical posture in water. Therefore,
Even in the turbulent flow of the breaking wave zone where the waves are visible, the leaf-like body 8 and the holding piece 4 supplely cover the seabed surface, hinder the flow of sediment, promote the accumulation of sediment and suspended matter, and It reliably prevents the foundation soil from being eroded by flowing earth and sand. As a result, a larger block of stone can be used, and the planar shape of the breakwater B1 can be reduced, thus reducing the construction cost and making the navigation of the ship safe. This has the same effect on submerged bank B2 (Fig. 10).
第５図及び第６図は、少くとも２つの離岸堤B1、B1を
築造し、それぞれの離岸堤B1の周りと、離岸堤１と海岸
Ａとの間に浸蝕防止マットＤを敷設した例である。この
浸蝕防止マットＤにより矢印で示す方向の土砂の流動を
抑え、離岸堤B1と海岸Ａとの間に海浜を造成することが
できる。5 and 6 show the construction of at least two breakwaters B1, B1 and the erosion prevention mat D around each of the breakwaters B1 and between the breakwater 1 and the seashore A. This is an example. With this erosion prevention mat D, the flow of earth and sand in the direction indicated by the arrow is suppressed, and a beach can be created between the breakwater B1 and the shore A.
第７図は、海岸Ａから離れた沿岸に長手方向に平行に
沖の方からそれぞれ少なくとも２つの離岸堤B1、B1潜堤
B2、B2を築造して周りに浸蝕防止マットＤを敷設し、更
に海岸Ａ側に浸蝕防止マットＤを敷設した例である。こ
れらにより土砂の移動を抑え、人工海浜を造成すること
ができる。Fig. 7 shows at least two offshore breakwaters B1, B1 submerged from the offshore in parallel to the coast away from coast A.
In this example, the erosion prevention mat D is laid around B2, B2, and the erosion prevention mat D is further laid on the shore A side. With these, the movement of earth and sand can be suppressed, and an artificial beach can be created.
第８図及び第９図は、海岸Ａから少し離れた沿岸に少
なくとも２つの離岸堤B1、B1を長手方向に離して築造
し、その長手方向に離した間10と離岸堤B1の周りに浸蝕
防止マットＤを敷設した例である。したがって、浸蝕防
止マットＤの長さ分だけ、離岸堤を小さくし、築造コス
トを低減することができ、また、浸蝕防止マットＤによ
り波の方向Ｅに対し浸蝕防止マットＤから海岸に向け対
向する方向に循環する２つの循環流Ｆ、Ｆが形成され
る。それら循環流による停滞渦流で独立水塊が形成さ
れ、良好な漁場が得られる。FIGS. 8 and 9 show that at least two breakwaters B1, B1 are constructed on the coast slightly away from the shore A and separated from each other in the longitudinal direction. This is an example in which an erosion prevention mat D is laid on the base. Therefore, the breakwater can be reduced by the length of the erosion prevention mat D and the construction cost can be reduced. In addition, the erosion prevention mat D faces the shore from the erosion prevention mat D in the wave direction E. Thus, two circulating flows F, F circulating in the direction of the flow are formed. An independent body of water is formed by the stagnant vortex caused by these circulation flows, and a good fishing ground can be obtained.
第10図は、少くとも２つの潜堤B2の間及び周りに浸蝕
防止マットＤを敷設した例である。この場合、葉状体８
の長さで潜堤B2の高さを容易に調整し、潜堤B2の設置水
深の制約をなくすことができる。また、内部波Ｇが潜堤
B2に衝突し、密度成層がこわれて鉛直混合が起こり、新
しい密度の水塊が形成され、その結果、良好な漁場が得
られる。FIG. 10 shows an example in which an erosion prevention mat D is laid between and around at least two submerged levees B2. In this case, the foliate body 8
The height of the submerged bank B2 can be easily adjusted by the length of the submerged bank B2, and the restriction on the installation depth of the submerged bank B2 can be eliminated. In addition, internal wave G is submerged
B2 strikes, breaking the density stratification and causing vertical mixing, forming a new mass of water, resulting in a good fishing ground.
［発明の効果］ 本発明は、以上説明したように構成されているので、
以下の効果を奏する。[Effects of the Invention] Since the present invention is configured as described above,
The following effects are obtained.
（ａ） 堤の周囲および離した部分に敷設された浸蝕防
止マットにより土砂の流動が抑制され、堤の基礎部分の
浸蝕を防止することができる。そしてその効果は、芝状
被覆材に比べてはるかに大きい。(A) The flow of earth and sand is suppressed by the erosion prevention mats laid around and apart from the embankment, so that erosion of the foundation portion of the embankment can be prevented. And the effect is much greater than turf-like coverings.
（ｂ） 堤の形状を小さくすることができ、また大きい
石塊が使用できるので築造コストの低減および工期の短
縮をすることができる。(B) Since the shape of the embankment can be reduced and a large stone block can be used, the construction cost can be reduced and the construction period can be shortened.
（ｃ） すでに築造されている堤に対しても、浸蝕防止
対策として実施することができる。(C) Measures can be taken to prevent erosion even for dikes that have already been built.
（ｄ） 浸蝕防止マットによって海岸の流れを変え、ま
たは阻止して人工海岸を造成し、あるいは良好な漁場と
することができる。(D) An artificial shore can be created by changing or preventing the flow of the shore by the erosion prevention mat, or a good fishing ground can be obtained.
第１図は本発明を実施する浸蝕防止マットを示す斜視
図、第２図は要部を示す縦棒の直交側面図、第３図及び
第４図は本発明の第１実施例を示す海岸の直交断面図及
び第３図の直交断面図、第５図及び第６図は本発明の第
２実施例を示す斜視図及び海岸の直交断面図、第７図は
本発明の第３実施例を示す海岸の直交断面図、第８図及
び第９図は本発明の第４実施例を示す斜視図及び平面
図、第10図は本発明の第５実施例を示す海岸の直交断面
図である。 Ａ……海岸、B1……離岸堤、B2……潜堤、Ｄ……浸蝕防
止マット、１……マット、４……保持片、８……葉状体FIG. 1 is a perspective view showing an erosion prevention mat embodying the present invention, FIG. 2 is an orthogonal side view of a vertical bar showing a main part, and FIGS. 3 and 4 are coasts showing a first embodiment of the present invention. 5 and 6 are perspective views showing a second embodiment of the present invention, and orthogonal cross sections of the seashore. FIG. 7 is a third embodiment of the present invention. 8 and 9 are perspective views and plan views showing a fourth embodiment of the present invention, and FIG. 10 is an orthogonal cross sectional view showing a shore showing a fifth embodiment of the present invention. is there. A: Coast, B1: Breakwater, B2: Submerged bank, D: Erosion prevention mat, 1: Mat, 4: Holding piece, 8: Foliate body
Claims (1)
堤の浸蝕防止工法において、堤（B1）を海岸（Ａ）にほ
ぼ平行にその平面形状を略矩形状に少なくとも２つ長手
方向に離して築造し、多数の細長い葉状体（８）の下部
をマット（１）に固着して砂の移動を制御する浸蝕防止
部材（Ｄ）を前記築造した堤（B1）の長手方向に離した
部分（10）および堤の周囲の海底に敷設することを特徴
とする堤の浸蝕防止工法。In a method for preventing erosion of a levee built on a coast slightly away from the shore (A), at least two levees (B1) are formed in a substantially rectangular shape in a plane substantially parallel to the shore (A) in a longitudinal direction. And an erosion preventing member (D) for controlling the movement of sand by fixing the lower portions of a large number of elongated leaves (8) to the mat (1) in the longitudinal direction of the embankment (B1). Erosion prevention method characterized by laying on the seabed around the part (10) and the embankment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63239687A JP2645486B2 (en) | 1988-09-27 | 1988-09-27 | Embankment erosion prevention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63239687A JP2645486B2 (en) | 1988-09-27 | 1988-09-27 | Embankment erosion prevention method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0288810A JPH0288810A (en) | 1990-03-29 |
| JP2645486B2 true JP2645486B2 (en) | 1997-08-25 |
Family
ID=17048418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63239687A Expired - Lifetime JP2645486B2 (en) | 1988-09-27 | 1988-09-27 | Embankment erosion prevention method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2645486B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100712199B1 (en) * | 2006-02-20 | 2007-04-27 | (주)에코원 | A structure for sand capture |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60100435A (en) * | 1983-11-05 | 1985-06-04 | Mitsubishi Electric Corp | Selective hardening method of applied liquid insulating material of semiconductor substrate |
| DE3403165A1 (en) * | 1984-01-31 | 1985-08-01 | Fa. Joh. Moritz Rump, 5990 Altena | DEVICE FOR GROUND STABILIZATION IN WATER CONSTRUCTION |
-
1988
- 1988-09-27 JP JP63239687A patent/JP2645486B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100712199B1 (en) * | 2006-02-20 | 2007-04-27 | (주)에코원 | A structure for sand capture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0288810A (en) | 1990-03-29 |
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